CPT® Code 81291

MTHFR (5,10-methylenetetrahydrofolate reductase) (eg, hereditary hypercoagulability) gene analysis, common variants (eg, 677T, 1298C)

The CPT® Code 81291 pertains to the molecular genetic testing of the MTHFR gene, specifically focusing on common variants such as 677T and 1298C. This testing is crucial for identifying mutations in the MTHFR gene, which encodes the enzyme methylenetetrahydrofolate reductase. This enzyme plays a vital role in the metabolism of amino acids, particularly in a biochemical pathway that converts 5,10-methylenetetrahydrofolate into 5-methyltetrahydrofolate. This conversion is essential for the transformation of the amino acid homocysteine into methionine, another amino acid necessary for various bodily functions. When mutations occur in the MTHFR gene, the enzyme's functionality is compromised, leading to an accumulation of homocysteine in the bloodstream. This condition is associated with hereditary hypercoagulability, a disorder characterized by an increased tendency to form blood clots. The inheritance pattern of this disorder is autosomal recessive, meaning that individuals must inherit the mutated gene from both parents to manifest the condition. Those who inherit the mutation from only one parent are considered carriers and typically do not exhibit symptoms. The MTHFR gene is located on chromosome 1, and the two most frequently identified mutations, 677T and 1298C, are linked to elevated levels of homocysteine and related hypercoagulability disorders. Elevated homocysteine levels can irritate blood vessels, contributing to atherosclerosis and increasing the risk of venous blood clotting. Treatment strategies for individuals with this disorder often include dietary supplementation with folate (folic acid) and vitamins B6 and B12. Molecular genetic testing is particularly indicated for individuals presenting with symptoms of hereditary hypercoagulability or those with a family history of the disorder, facilitating early diagnosis and management.